.container{
  width: 100vw;
  height: 100vh;
  position: relative;
}
.pics{
  overflow: hidden;
  white-space: nowrap;
}
.pic img{
  display: none;
}
.pic .active{
  display: inline-block;
  width: 100vw;
  height: 100vh;
}
.prev,.next{
  position: absolute;
  height: 80px;
  width: 80px;
  top: calc(50vh - 40px);
  font-size: 8rem;
  text-align: center;
  line-height: 80px;
  color: deepskyblue;
}
.prev{
  left: 20px;
}
.next{
  right: 20px;
}
